Ole Andreas Halvorsen is a Norwegian-American billionaire hedge fund manager. He is the Co-Founder and CEO of Viking Global Investors, a Connecticut-based hedge fund he established in 1999 with David Ott and Brian Olson. As of October 2017, Viking Global Investors managed $24 billion. Halvorsen is recognized as one of the "Tiger Cubs," a group of hedge fund managers who previously worked for Julian Robertson's Tiger Management Corporation.